IG Chemistry-5 Chemical calculation (5.1)

What is the definition of a mole in chemistry?

• A mole is a type of chemical reaction in which two substances combine to form a new substance.

• A mole is a unit of measurement in chemistry that represents the amount of a substance.

• A mole is a unit of measurement in chemistry that represents the volume of a substance.

• A mole is a small, furry animal commonly found in gardens.

Calculate the number of moles in 36 grams of water (H₂O).

• 2

• 5.0

• 2.5

• 0.5

What is the total number of atoms in 1.0 mole of CO₂?

• 1.5 x 10²³
• 12 x 10²³
• 3 x 10²³
• 18 x 10²³

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

• SO
• SO₂
• SO₃
• SO₄

How many grams is 1.2 moles of Ne?

• 0.05 grams
• 16.6 grams
• 21.2 grams
• 24 grams

Tags

NGSS.HS-PS1-7

The molar mass of an element is equal to its...

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

Calculate the molar mass for Al(OH)₃

• 78.0 g/mol

• 72 g/mol

• 28 g/mol

• 25 g/mol

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram